Problem with Road Mesh Collision if used with Spline Mesh

@MostHost_LA The collision of the orignal mesh looks like this:

  • Complex collision:

  • Simple Collision:

And yes i have “Use Complex Collision As Simple” selected.

Regarding “it won’t work with sheets”, so it is generally better to have a closed mesh if working with a spline, if i interpret this correctly?

My next try would be to create custom collision in blender and re-import the mesh.

Update: I have now tried to make a custom collision in blender.
In Blender it looks like this:

And is Prefixed “UCX_” and in the asset browser it looks like this:

When i look in the editor with “Player collision” as view mode i get this result:

On the right barely the static mesh version of the road piece and one the spline the left.

Update #2: For testing purposes i have now created a very simple closed mesh.

But with this it still occurs as soon as the spline gets closer to another static mesh with collision:

As soon as a certain distance between the spline and the static mesh is given the collision starts working: